id Software Developer of the Quake and Doom series. http://www.idsoftware.com/

The Apogee FAQ: What is Apogee's relationship with id? Explain's the shared history of the two companies. http://www.rinkworks.com/apogee/s/2.7.1.shtml

Inevitable Entertainment Inc. A next-generation video game development studio in Austin, Texas. http://www.inevitable.com/